Method for processing an image of a papillary impression

Method for processing an image of a papillary print designed to be executed by a computer, comprising:

• a) a step for detecting at least one singular zone on the image, each singular zone being characterised by a position (p), and an orientation (θ) representative of a value of the gradient of the intensity of the image at position (p);
• b) a step for extracting patches, called control patches, each control patch comprising one of the singular zones detected in step a);
• c) a step for projecting control patches in a base of reference patches, called reference base, so as to determine the projection coordinates of each control patch on said reference base, projection of a control patch on the reference base forming a projected patch, the reference patches base comprising at least two reference patches each associated with a different type of singular zone;
• d) a step for calculating a difference in projection of control patches relative to the projected patches.